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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dd98f49ddae4e3e24f04f73bac55b627a40e84d6dbd0a796b99d8135f768e1' 
  AND token = 'F5Anwq1N8ORReGXQosg2C/nN7DkcRQLIzasXLQkUgEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}